### Construct a confidence interval for the difference

Assignment Help Basic Statistics
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1. A clinical trial is run to evaluate the effectiveness of a new drug to prevent preterm delivery. A total of n=250 pregnant women agree to participate and are randomly assigned to receive either the new drug or a placebo and followed through the course of pregnancy. Among 125 women receiving the new drug, 24 deliver preterm and among 125 women receiving the placebo, 38 deliver preterm. Construct a 95% confidence interval for the difference in proportions of women who deliver preterm

2. clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo. Pregnant women are enrolled and randomly assigned to receive either the experimental drug, the standard drug or placebo. Women are followed through delivery and classified as delivering preterm (< 37 weeks) or not. The data are shown below.

 Preterm Delivery Experimental Drug Standard Drug Placebo Yes 17 23 35 No 83 77 65

Using this data, generate a 95% confidence interval for the difference in proportions of women delivering preterm in the experimental and standard drug treatment groups

3. The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol. Generate a 95% confidence interval for the proportion of all patients with total cholesterol < 200.

 New Drug (n=75) Placebo (n=75) Total Sample (n=150) Mean (SD) Total Serum Cholesterol 185.0 (24.5) 204.3 (21.8) 194.7 (23.2) % Patients with Total Cholesterol < 200 78.0% 65.0% 71.5%

4. A study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not. The data are shown below.

 Regular Exercise N Mean Std Dev Yes 35 48.5 12.5 No 120 56.9 11.9

Generate a 95% confidence interval for the difference in mean HDL levels between men who exercise regularly and those who do not.

5. The following table shows the distribution of BMI in children living in US and European urban neighborhoods. (The data are in millions.)

 Neighborhood Normal Weight Overweight Obese US 125 50 40 Europe 101 42 21

What proportion of children living in a US urban neighborhood is overweight?

6. The following table shows the distribution of BMI in children living in US and European urban neighborhoods. (The data are in millions.)

 Neighborhood Normal Weight Overweight Obese US 125 50 40 Europe 101 42 21

What proportion of children is overweight?

7. The following table shows the numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status.

 Underweight Normal Weight Overweight Obese Diabetes 8 34 65 43 No Diabetes 12 85 93 40

What proportion of patients is overweight?

8. What is the best type of graph to display the following data?

 Gender Cigarettes per day Female 45 Male 20 Female 30 Female 40 Male 90 Male 50 Male 20 Male 23 Female 9

9. What is the best type of graph to display the following data?

Duration of hospital stay:

5, 10, 6, 11, 5, 14, 30, 11, 17, 3, 9, 3

10. What is the best type of graph to display the following data?

GDP per capita fertility rate

3432.0224      3.783

6882.4069      4.026

678.99817      4.508

3623.5324      2.338

5741.2071      1.399

35477.473       1.43

47548.688       2.04

691.36909        2.3

19858.343       1.45

39152.308      1.994

2942.4385      3.221

14623.479      2.175

4387.7071      2.436

84732.957       1.52

3928.8789      2.546

1455.1022      2.479

24646.021      2.644

3056.1185      2.735

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This assignment is written in word with all the questions solved with relevant formulas involved. Is is basically on the comparison of data and data representation. It is original work.

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6/21/2017 4:39:02 AM

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5/31/2017 12:18:27 PM

11 question 4 pages please answer the following questions . Construct a 95% confidence interval for the difference in proportions of women who deliver preterm